The Maryland State Fire Marshal’s Office is investigating four fires intentionally set over the weekend in La Plata, Indian Head, Bel Alton and Rock Point.

Fire officials do not believe the fires are linked.

At 7:30 a.m. April 7, 25 firefighters from departments in Cobb Island, Newburg, Bel Alton and La Plata, along with the 7th District in St. Mary’s County, took 10 minutes to control a fire at a vacant building at 16229 Ceder Lane in Rock Point, which Bill Goldsmith, chief of the Cobb Island Volunteer Fire Department, said was at one time an oyster shucking house.

There was $100 worth of damage to the building.

According to the fire marshal’s report, the fire was discovered by someone driving by.

The Potomac Heights Volunteer Fire Department responded at 8 a.m. Saturday for a fire at a vacant wood-framed boat shed at 4175 Milburn Place in Indian Head. According to a release, someone set fire to combustible materials inside the shed. Owner Robert Diedrich discovered the fire and called 911.

No injuries were reported. The shed had negligible value prior to the fire, and a fire marshal’s news release said it suffered $1 in damage.

Two additional arsons took place Sunday morning. One was put out by a tenant and neighbor, and the other went out on its own.

At 1:30 a.m. April 7, someone set fire to combustible materials outside a kitchen window of an apartment at the Thunderbird Apartments in Bel Alton.

A neighbor discovered the fire and informed the tenant, Linda Marie Cooper. The two extinguished the fire prior to notifying authorities, according to the report. There was $500 in damage, and no injuries were reported.

At 2:30 a.m. Sunday, someone set fire to the front porch of a townhouse on Jennie Run Drive in La Plata.

The homeowner discovered the fire damage in the morning after the fire burned itself out. No injuries were reported.

There was $1,500 in damage to the front door area of the property.

Anyone with information on any of the fires is asked to call 443-550-6820.